4 NEW HAMPSHIRE EXPERIMENT STATION [Bulletin 271 



the winter. Lime and manure, both the basic applications and vari- 

 ables, were applied in April and May 1926. After working the land 

 at intervals to mix the lime and mannre thoroughly with the soil, the 

 fertilizer variables were applied, except nitrate of soda. The latter 

 was broadcast on the plots receiving that material about two weeks after 

 seeding. 



The seed was sown on June 23, 1926, at the rate of 17 pounds per 

 acre. No other seed was used in the alfalfa area. 



No lime or manure has been applied since 1926. On those plots re- 

 ceiving them, fertilizers have been broadcast annually between April 

 15 and May 1, except in 1927. Five applications of fertilizer have 

 been used to date. 



The plots in this experiment are in triplicate, and each is one-twenti- 

 eth of an acre in extent. There is one check plot for every three treated 

 plots, and 48 plots in all. 



The various treatments are here listed : 

 1. Check plots, basic treatment of 20 T. manure and 2 T. ground lime- 

 stone. 

 *' " plus 2 T. ground limestone. 



" " plus 100 lbs. nitrate of soda per A. 



" ** plus 500 lbs. 1G'( superphosphate per 



A. 

 " " plus 150 lbs. muriate of potash per A. 



" " plus 20 T. manure per A. 



" ** plus 2 T. ground limestone and 500 



lbs. superphosphate per A. 



8. L M ** ** plus 2 T. ground limestone and 20 T. 



manure per A. 



9. M P " " plus 20 T. manure and 500 lbs. super- 



phosphate per A. 



10. M L P " " plus 20 T. manure, 2 T. ground lime- 



stone and 500 lbs. superphosphate 

 per A. 



11. M L N P " " plus 20 T. manure. 2 T. ground lime- 



stone, 100 lbs. nitrate of soda and 

 500 lbs. superphosphate per A. 



12. M L P K " " plus 20 T. manure. 2 T. ground lime- 



stone, 500 lbs. superphosphate and 

 150 lbs. muriate of potash per A. 



13. M L N P K " " plus 20 T. manure, 2 T. ground lime- 



stone, 100 lbs. nitrate of soda, 500 



lbs. superphosphate and 150 lbs. 



muriate of potash per A. 



Although the alfalfa on these plots grew to a height of approximately 



24 inches in the fall of 1926, no harvest was made. In March 1927 the 



dead alfalfa tops from the preceding year's growth were raked and 



carted off the field. 



Starting with 1927 and through 1931, two harvests were made an- 

 nually. In Table I is presented the average yield of each treatment 

 for each cutting. 



